To test the performance of its tires, a car travels along a perfectly flat (no banking) cir-
cular track of radius 284 m. The car increases
its speed at uniform rate of
at
4.8 m/s?
dt
until the tires start to skid.
If the tires start to skid when the car reaches
a speed of 39.6 m/s, what is the coefficient of
static friction between the tires and the road?

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2